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(No Model.) 8 2 Sheets-Sheet l. 0. L. NOBLE & E. ()I-IILDS.

- HEEL TRIMMING MACHINE. No. 389,759. Pate ept.18, 1888.

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0. L. NOBLE & E. OHILDS.

HEEL TRIMMING MACHINE.

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UNITED STATES PATENT OFFICE.

OSCAR L. NOBLE AND EUGENE OHILDS, OF BOSTON, MASSACHUSETTS, AS- SIGNORSTO THE UNION HEEL TRIMMER COMPANY, OF SAME PLACE.

HEEL-TRIMMING MACHINE.

SPECIFICATION forming part of Letters Patent No. 389,759, datedSeptember 18,1888 I I Application filed June 23,l8F'8. Serial No.277,985. (No model.)

To all whom it may concern:

Be it known that we, OSCAR L. NOBLE and EUGENE OHILDs, of Boston, in thecounty of Suffolk and State of Massachusetts, have invented certain newand useful Improvements in Heel-Trimming OutterHeads, of which thefollowing is a specification.

This invention has for its object to provide an improved heel-trimmingcutter-head of the class in which the cutting knives or blades areclamped between two shoulders or collars on a shaft.

jaws enabling their grooves to conformto the inclination or curvature ofdifferent blades.

The invention also consists in certain improvements inthe means forsupporting the backs of the blades of the cutter at different points, asmay be required by the forward movement of the blades from time to timeto compensate for wear of their cutting-edges.

The invention also consists in certain details, all of which we will nowproceed to describe and claim.

Of the accompanying drawings, forming a part of this specification,Figure 1 represents a top view of a cutter having our improvements, saidview showing, also, a counter-guard and rests for the side and top liftof the heel. Fig. 2 represents an end view of the cutterhead. Fig. 3represents a side view of the cutter-head, one of the collars beingpartly in section. Fig. 4 represents a section on line a: m, Fig. 2.Fig. 5 represents a section on line y 3 Fig. 3. Fig. 6 represents apartial longitudinal section of the cutter-head, showing a straightblade. Fig. 7 represents a section of the collar '1) on the line z z,Fig. 3, the swiveled jaw or holder being shown in side elevation in saidfigure. Fig. 8 shows end elevations of the jaw or holder. Fig. 9represents a perspective view of one of the blades, and Fig. 10 an endview of the same.

The same letters of reference indicate the same parts in all thefigures.

In the drawings, a represents the shaft of our improved cutter-head, andb 0 represent the collars, between which the cutting-blades d d areheld, the larger collar, 1), being rigidly affixed to the shaft in anysuitable way, while the outer collar, 0, is movable on the shaft towardand fromthe collar b, and may be adj usted on the shaft to either holdor release the blades 61 by a nut, 6, contained in an annular cavityformed in the outer side of the collar 0, and engaged with thescrew-threaded outer end of the shaft a. The side edges of the bladesare fitted in grooves, and are firmly clamped by a movement of thecollar 0 toward the collar b, and released by an opposite movement ofthe collar 0.

Heretofore cuttersof the general construction above described have hadboth of the knifereceiving grooves formed in'inner surfaces of thecollars b c.

In carrying out our invention, instead of forming the groove that holdsthe inner end of each blade directly in the collar 1), we provide saidcollar with sockets or cavities g, in which are fitted cylindrical jawsor knifeholders h-one for each blade. Each holder h has a longitudinalgroove, i, in one side, formed to receive the inner end of a blade, d,the opposite end of said blade being held, as usual, in a groove, k,formed in the inner side of the collar 0.

Each holder h is adapted to rotate in its socket, butis prevented frommoving endwise by a stud, m, inserted in the collar b and entering aperipheral groove, 12, in the holder h. The holder is therefore adaptedto be turned so that its groove *5 will stand at any desired angle andcon-form automatically to the shape or curvature of different blades.\Vhen the blade is considerably curved at its inner end, the outer endof the groove t will be higher than its inner end, as shown in Fig. 4,

and when the knife has a lesser curvature the holder 'will be turned tobring the outer end of its groove toward the center of the cutter. Incase the blade has no curvature, as shown in Fig. 6, the outer end ofthe groove will be lower or nearer the center of the cutter than itsinner end. The groove i extends radially from the periphery of theholder it to the center thereof, and is formed so that the cuttingedgeof the blade will extend to the center of the holder h, and willtherefore always have the same relation to the holder and the collarbthat is to say, the end of the euttingedge will be on the axis ofrotation of the holder, so that said end will always be at the samepoint whatever may be the shape or curvature of the blade. It will beseen, therefore, that the rotatable or swiveled holders in the collar 1)enable difierentlyshaped blades to be used interchangeably with the samecot lars.

The groove 2' is preferably made V-shaped, both of its sides extendingradially from the centerof thejaw or holder h. Theend 2 of the bladethat is inserted in the groove i is beveled to give it a V shape,fitting the groove 1', the cuttingedge 3 of said blade being continuedto the apex of the V, as shown in Figs. 9 and 10, so that said cuttingedge extends, as already stated, to the center of the jaw or holder.

The V shape of the groove 2' and of the end of the blade enables theblade to be easily inserted in the groove and to fit accurately therein,the beveled surface or end 2 having the same angle with relation to thecuttingedge in all the cutters. Said beveled end cooperates with thecorresponding side of the groove 2' in the jaw or holder to force theextreme end of the cutting-edge exactly to the inner. end of the groove1', thus insuring the location of the end of the cutting edge at theaxial center of thejaw or holder.

p represents a plate, which is secured by bolts q q to the inner side ofthe collar b,and is pro-- vided with lugs 7 1', which bear against theheels or rear ends of the blades (1 and support the same against thebackward pressure exerted upon them when in operation. Said plate isprovided with segmental slots 8, through which the bolts qq pass, saidslots enabling the plate 1) to be adjusted to conform to the adjustmentsof the blades required to compensale for wear of their cutting-edges.The edges of the plate 1) between the blades are preferably milled at 22, and formed to project slightly outside of the periphery of the collarZ),so that the plate can be conveniently grasped and turned, as shownonly in Fig. 3.

It is obvious that one or more holdersflt, and blades (1 may be used ineach cutterhead.

it represents a top-lift rest, U a rest for the side of the heel, and wa counter-guard supported by a swinging arm, 10', said parts a i) 10being well-known adjuncts of a heel-trimming machine. The top-lift resta is arranged with its shorter wall,whieh supports the edge of the toplift about flush with the inner end of the cutting-edge of the blade :1,as shown in Fig. 1.

We claim 1. A cutter-head of the class herein described, haviug ajournaled holder in one of its collars provided with a blade-receivinggroove, as set forth.

2. In a cutter-head of the class herein described, the combination ofacollar having a socket, a holder or jaw journaled in said socket andprovided with a blade-receiving groove, and means for preventinglongitudinal move ment of said holder in the socket, as set forth.

3. The improved cutter-head composed of the adjustable collar 0, havinggrooves k, the fixed collar 1), having the swiveled grooved holders orjaws 7e, and the blades inserted in the grooves of the collar 0 and jawsh, as set forth.

4. In a cutter head, the combination of the adjustable grooved collar 0,the fixed collar having the swiveled grooved jaws or holders h, theblades held by said grooved collar and swiveled jaws, and the adjustableplate having bladesupporting lugs and projecting milled edges, as setforth.

5. As an improvement in cutter-heads, the cutting-blade having the end2, which is beveled on the backof the blade to form an acute angle withthe inner surface of the blade, and the cutting edge 3,formed on theinner surface of the blade and extended to the apex of said angle,whereby the cutting-edge is extended at one end of the blade beyond theangle formed by the intersection of the end 2 with the back ofthe blade,and is adapted to enter the apex ofa V-shapcd groove in ajournaledholder.

6. A cutter-blade having the beveled end 2, forming an acute angle, andthe cut-ting-edge 3,extended to the apex of said angle, combined withthe cyliudricaljaw or holder it, having a Vshaped groove, the apex ofwhich is at the axial center of the jaw, as set forth.

In testimony whereof we have signed our names to this specification, inthe presence of two subscribing witnesses, this 19th day of June, A. l).1888.

OSCAR L. NOBLE. EUGENE OHILDS.

\Vitnesses:

O. F. BROWN, A. D. HARRIsoN.

